Check engine light came on and said it was a MAF IAT sensor

MIEC

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2004 MERCEDES BENZ C230

72,000 MILES

I have a 2004 Mercedes C230 Kompressor. The check engine light came on and said it was a MAF/IAT sensor. I replaced it and still have the check engine light on. Any idea of what else could cause the light to continue on? Note I have not noticed anything out of the ordinary. Replaced sensor, reset the code and the light still is on. Rechecked the code and still get MAF/IAT

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Monday, January 30th, 2012 AT 6:51 PM

13 Replies

SATURNTECH9

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If it were only that easy when you get a code it only means that there is a issue with that circuit or system in the car. It doesnt mean to just replace the part and your all fixed. Unless you have a internal pcm code etc that the trouble tree tells you to replace a part. So do you have a scan tool that reads live engine data?That would really help you to diagnose this code also a multimeter?Also which engine do you have?

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Monday, January 30th, 2012 AT 7:50 PM

MIEC

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I have the 1.8L Kompressor engine. I don't have a scan tool to read live data. I do have a multimeter.

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Monday, January 30th, 2012 AT 8:45 PM

SATURNTECH9

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What is the exact code number you have?

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Tuesday, January 31st, 2012 AT 4:42 AM

MIEC

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The code is 0110

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Tuesday, January 31st, 2012 AT 6:33 PM

SATURNTECH9

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That code has to do with just the air inlet temp sensor your really going to need a scan tool you can see the intlet temp sensor readings. That way you can move wires and watch the temp etc.I would say you have terminal tightness issue or a wire damaged somewhere or from vibration the wire broke inside the insullation of the wire.

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Tuesday, January 31st, 2012 AT 8:22 PM

MIEC

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Do you have a wiring diagram that would show which wires on the sensor would correspond to the inlet temperature sensor as the actual sensor is a combination MAF/IAT?

As a side note I have not noticed any performance issues because of the code. I still want to get it cleared.

Thanks.

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Wednesday, February 1st, 2012 AT 8:56 PM

SATURNTECH9

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I see a seperate air intake sensor in the wire diagram.

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Wednesday, February 1st, 2012 AT 9:37 PM

MIEC

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Thanks for the wiring diagram. Are you sure this is for the 2004 1.8L Kompressor engine. I have the combination MAF/IAT sensor. There is 1 plug with 5 wire connections, 1 is blank. I would like to check continuity from the sensor plug to the ecm plug. I just need to know which numbers on each correspond to the IAT.

Thanks

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Friday, February 10th, 2012 AT 11:11 PM

MIEC

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Just checked again and it is for sure not the correct wiring diagram. I am looking for the M labeled wiring harness.

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Saturday, February 11th, 2012 AT 12:19 AM

SATURNTECH9

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M labeled?What do you mean M labeled diagram?It just says 2004 C230 as you can read at the top of the diagram.

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Saturday, February 11th, 2012 AT 12:26 AM

MIEC

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There is an M on the wiring harness where it connects to the ecm

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Saturday, February 11th, 2012 AT 12:32 AM

MIEC

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So do you have the wiring diagram for the 2004 c230 1.8L Kompressor?

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Saturday, February 11th, 2012 AT 4:40 PM

MIEC

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OK so I checked the wiring to the IAT. It is good. The IAT is new and I still get the 0110 engine code. What else did you say could be the problem.